onsemi SZMMSZ4714T1G

Overview

SZMMSZ4714T1G from onsemi is a 33 V ±5% Zener voltage regulator diode in SOD−123 package, rated for 500 mW power dissipation at 75°C, with 50 µA test current (IZT), 25.0 V reverse voltage (VR) at 1 µA leakage, and −55°C to +150°C operating temperature range - used for precision voltage reference and overvoltage protection in automotive power management circuits.

For engineers reviewing the SZMMSZ4714T1G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance, low IZT requirement, thermal derating behavior, AEC−Q101 qualification status, and SOD−123 footprint compatibility with high-density PCB layouts.

Technical Context

This device operates as a two-terminal shunt voltage regulator, maintaining stable output voltage across variable load currents by conducting reverse breakdown current above its nominal 33 V Zener threshold. Its low 50 µA test current enables efficient biasing in low-power sensing and monitoring circuits.

The SOD−123 package provides 150°C/W junction-to-lead thermal resistance and supports automated placement; its −55°C to +150°C junction temperature range and Class 3 ESD rating (>16 kV HBM) meet automotive-grade reliability requirements per AEC−Q101.

Key Specifications

Pinout & Package

SOD−123 surface-mount package: 1.60 mm × 2.69 mm × 1.16 mm body size, cathode indicated by polarity band, void-free thermosetting plastic case rated UL 94 V−0.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener voltage regulation applications.

Compared with MMSZ4714T1G and BZX84-C33LT1G, SZMMSZ4714T1G uniquely combines AEC−Q101 qualification, 500 mW power capability in SOD−123, and low 50 µA test current - making it the only option qualified for safety-critical automotive voltage reference and clamp functions without layout or thermal redesign.

Availability

SZMMSZ4714T1G is available at Aetrix Electronics and suitable for automotive engine control units, industrial sensor interfaces, and medical diagnostic equipment requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for SZMMSZ4714T1G includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

onsemi (Semiconductor Components Industries, LLC) is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.

SZMMSZ4xxxT1G series is part of onsemi's automotive-qualified Zener regulator portfolio, designed specifically for voltage reference, overvoltage protection, and ESD suppression in harsh-environment electronic control modules.

FAQ

What is the Zener voltage tolerance of SZMMSZ4714T1G?

The SZMMSZ4714T1G has a nominal Zener voltage of 33 V with a tolerance of ±5%, meaning its actual breakdown voltage falls between 31.35 V and 34.65 V when tested at IZT = 50 µA and TA = 25°C. This tolerance remains valid across the full −55°C to +150°C operating junction temperature range, as confirmed in the onsemi datasheet revision 13.

Is SZMMSZ4714T1G suitable for automotive applications?

Yes, SZMMSZ4714T1G is AEC−Q101 qualified and PPAP capable, with manufacturing site and process controls specific to automotive requirements. It meets rigorous stress tests including temperature cycling, high-temperature operating life, and unbiased highly accelerated stress testing - making SZMMSZ4714T1G appropriate for engine control, body electronics, and ADAS subsystems.

What is the maximum power dissipation for SZMMSZ4714T1G at 100°C ambient?

At 100°C ambient, SZMMSZ4714T1G must be derated from its 500 mW rating at 75°C using the 6.7 mW/°C derating factor. The allowable power becomes 500 mW − (100°C − 75°C) × 6.7 mW/°C = 332.5 mW. This value assumes FR−5 board mounting with minimum recommended footprint per the onsemi datasheet.

Does SZMMSZ4714T1G have a specified dynamic impedance?

Dynamic impedance (ZZT) for SZMMSZ4714T1G is not explicitly tabulated in the datasheet, but Figure 5 shows typical ZZT ≈ 100 Ω at IZ = 20 mA for 33 V-class devices. At the standard test current of 50 µA, impedance rises significantly - consistent with Zener diodes' inverse relationship between current and impedance - so designers should verify dynamic response under actual operating current in their circuit.

How does the leakage current of SZMMSZ4714T1G compare at 25 V versus 33 V reverse bias?

SZMMSZ4714T1G specifies IR ≤ 1 µA at VR = 25.0 V (page 3, Electrical Characteristics table). At voltages approaching its nominal 33 V Zener point, leakage increases exponentially - Figure 9 shows typical IR rising to ~10 µA near 33 V at 25°C. This behavior is inherent to Zener conduction onset and must be accounted for in low-current bias networks.